Oil injector for movable head sheave of winch

The utility model relates to the field of movable head sheave oil injection, in particular to a winch movable head sheave oil injector which comprises two derricks, supports are fixedly connected to the tops of the two derricks, and mounting plates are fixedly connected to the tops of the supports. The oil injection mechanism is used for injecting oil into the movable head sheave and is mounted between the two derricks; by arranging the oil injection assembly, when oil is injected into the movable head sheave body, a motor drives a stirring rod to rotate, the stirring rod drives stirring blades to rotate while rotating, grease in an inner cavity of an oil tank is stirred, a booster pump sucks external gas and injects the external gas into the inner cavity of the oil tank while stirring is conducted, and the interior of the oil tank is pressurized; grease in the inner cavity of the oil tank is automatically injected into the inner cavity of the filter along with the increase of the pressure, and then the greas